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CC2538DK: Watchdog timer and UART - CC2538

Part Number: CC2538DK

I am trying to add the hardware watchdog timer feature for CC2538DK, so I connect the PD5 of CC2538 to WDI of TPS3823-33DBVR, but UART(PA0 & PA1) is not working when the watchdog timer is connected with that pin(PD5). what could be the possible issue?